oRIGIN OF THE FIRST CELLS
M.C. Flor Argelia Tiburcio León
OBJECTIVES & LEARNING OUTCOMES
Students will be able to IDENTIFY the characteristics of the endosymbiotic theory and the unicellular and pluricellular organisms
Students will be able to distinguish the principles of the origin of the first cells
Edpuzzle Video
https://www.youtube.com/watch?v=q71DWYJD-dI
How do you think the first cells where developed?
Write in YOUR NOTEBOOK & BE READY TO PARTICIPATE!
CELL THEORY
states that
- All living things are composed of cells.
- The cell is the smallest unit of life.
- Cells only arise from pre-existing cells
CELLS MULTIPLY THROUGH DIVISION
gROWTH
Resulting on cell division
GENETIC CODE IS UNIVERSAL
- A codon is a combination of 3 DNA bases.
- Produces the same aminoacid in translation regardless of the organisms.
- The logical deduction is that all cells have arisen as the result of cell division from a single common ancestor.
LOREM IPSUM DOLOR SIT
eARTH'S ATMOSPHERE
Did not contain oxygen gas after plants started photosyntesis process.
THE FIRST CELLS MUST HAVE ARISEN FROM NON-LIVING MATERIAL
GASES CAME FROM VOLCANIC ACTIVITY
Cells can only be formed by division of pre-existing cells
Cells multiply through division
- Mitosis results in genetically identical diploid daughter cells.
- Meiosis generates haploid gametes (sex cells)
Highly complex organisms
Phospolipids and other amphipathic molecules natural assemble into bilayers, if conditions are correct.
REMEMBER
mILLER AND UREY
Formation of the bilayer creates an isolated internal environment
The formation of an internal environment means that optimal conditions, e. g. for replication or catalysis can be maintained
dEEP SEA THERMAL VENTS
formation of membranes to package the organic molecules
FORMATION OF MEMBRANES
formation of polymers that can self replicate
DNA THOUGH VERY STABLE IT IS NOT ABLE TO SELF-REPLICATE - ENZYMES ARE REQUIRED HOWEVER RNA CAN STORE INFORMATION AND SELF-REPLICATE - it can catalyze the formation of copies of itself. BY REACTIONS - RYBOZYMES In ribosomes RNA is found in the catalytic site and plays a role in peptide bond formation
Who was Lynn Margulis?
Go to classroom
- Read the article about the scientist.
- Answer the questions about her work.
- Elaborate an infographic about her discovery "The Endosymbiotic Theory"
ENDOSYMBIOTIC THEORY
eXISTENCE OF EUKARYOTES
Theory states that the organelles (mitochondria and chloroplasts) originated symbioses between separate single-celled organisms.
DEVELOPMENT OF THE NUCLEUS
a prokaryote grows in size and develops folds in it's membrane to mantain efficient volume
DEVELOPMENT OF THE MITOCHONDRIA
AN AEROBIC PROTEOBACTERIUM ENTERS A LARGER ANAEROBIC PROKARYOTE
- It survives digestion to become a valuable endosymbiont.
- The aerobic proteobacterium provides ATP to it's host enabling it to auto-compete other anaerobic prokaryotes .
- As the host cell grows and divides so does the proteobacterium.
- The aerobic proteobacterium evolves and is assimilated and to become a mitochondrion
EVIDENCE
- They have their own DNA.
- They have ribosomes that are similar to prokaryotes.
- The double membrane and the inner membrane has proteins similar to prokaryotes.
- They are roughly the same sizeas bacteria and are susceptible to the antibiotic chloramphenicol.
- They transcribe their DNA and use the mRNA to synthesize their own proteins.
- They can only be produced by division of pre-existing mitochondrion and chroloplasts.
Unicellular and pluricellular organisms
GO TO THE QUIZLET
rEAD ABOUT uNICELLULAR AND MULTICELLULAR ORGANISMS
PLAY WITH YOUR CLASSMATES!
https://quizlet.com/_acmef5?x=1jqt&i=3zx08x
MORE ABOUT CLASIFICATION OF CELLS...
FINAL ACTIVITY
Cells
Origin
- Compete in class
- Upload a screenshot in classroom
Pluricellular
Unicellular
https://create.kahoot.it/share/the-origin-of-the-cells/01dffc07-518a-4121-8b27-f8561e0b7202
Origin of the First Cells
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Transcript
oRIGIN OF THE FIRST CELLS
M.C. Flor Argelia Tiburcio León
OBJECTIVES & LEARNING OUTCOMES
Students will be able to IDENTIFY the characteristics of the endosymbiotic theory and the unicellular and pluricellular organisms
Students will be able to distinguish the principles of the origin of the first cells
Edpuzzle Video
https://www.youtube.com/watch?v=q71DWYJD-dI
How do you think the first cells where developed?
Write in YOUR NOTEBOOK & BE READY TO PARTICIPATE!
CELL THEORY
states that
CELLS MULTIPLY THROUGH DIVISION
gROWTH
Resulting on cell division
GENETIC CODE IS UNIVERSAL
LOREM IPSUM DOLOR SIT
eARTH'S ATMOSPHERE
Did not contain oxygen gas after plants started photosyntesis process.
THE FIRST CELLS MUST HAVE ARISEN FROM NON-LIVING MATERIAL
GASES CAME FROM VOLCANIC ACTIVITY
Cells can only be formed by division of pre-existing cells
Cells multiply through division
Highly complex organisms
Phospolipids and other amphipathic molecules natural assemble into bilayers, if conditions are correct.
REMEMBER
mILLER AND UREY
Formation of the bilayer creates an isolated internal environment
The formation of an internal environment means that optimal conditions, e. g. for replication or catalysis can be maintained
dEEP SEA THERMAL VENTS
formation of membranes to package the organic molecules
FORMATION OF MEMBRANES
formation of polymers that can self replicate
DNA THOUGH VERY STABLE IT IS NOT ABLE TO SELF-REPLICATE - ENZYMES ARE REQUIRED HOWEVER RNA CAN STORE INFORMATION AND SELF-REPLICATE - it can catalyze the formation of copies of itself. BY REACTIONS - RYBOZYMES In ribosomes RNA is found in the catalytic site and plays a role in peptide bond formation
Who was Lynn Margulis?
Go to classroom
ENDOSYMBIOTIC THEORY
eXISTENCE OF EUKARYOTES
Theory states that the organelles (mitochondria and chloroplasts) originated symbioses between separate single-celled organisms.
DEVELOPMENT OF THE NUCLEUS
a prokaryote grows in size and develops folds in it's membrane to mantain efficient volume
DEVELOPMENT OF THE MITOCHONDRIA
AN AEROBIC PROTEOBACTERIUM ENTERS A LARGER ANAEROBIC PROKARYOTE
EVIDENCE
Unicellular and pluricellular organisms
GO TO THE QUIZLET
rEAD ABOUT uNICELLULAR AND MULTICELLULAR ORGANISMS
PLAY WITH YOUR CLASSMATES!
https://quizlet.com/_acmef5?x=1jqt&i=3zx08x
MORE ABOUT CLASIFICATION OF CELLS...
FINAL ACTIVITY
Cells
Origin
Pluricellular
Unicellular
https://create.kahoot.it/share/the-origin-of-the-cells/01dffc07-518a-4121-8b27-f8561e0b7202